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Influence of Metal ions and Acid Treatment on Reactivity of Bamboo Dissolving Pulp
Received:May 13, 2022  
DOI：10.11980/j.issn.0254-508X.2022.08.007
Key Words:metal ions  acid treatment  chelating agent  bamboo dissolving pulp  reactivity
Author NameAffiliationPostcode
CHEN Qiuyan* College of Material Engineering， Fujian Agriculture and Forest University， Fuzhou， Fujian Province， 350108 350108
HUANG Liulian College of Material Engineering， Fujian Agriculture and Forest University， Fuzhou， Fujian Province， 350108 350108
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Abstract:The effects of Ca2+， Cu2+， Fe2+， Fe3+， Mn2+ and Mg2+ on Fock reactivity of bamboo dissolving pulp were studied. Using acid-alone treatment and then introducing the diethylene triamine pentaacetic acid （DTPA） into the acid treatment to process dissolving pulp， the effects of pH value and DTPA amount on Fock reactivity， ash content， brightness and polymerization degree were investigated. For dissolving pulp， metal ions， especially iron ions， significantly deteriorated the reactivity of bamboo dissolving pulp. Decreasing pH value was beneficial to improve reactivity of bamboo dissolving pulp. In the meantime， the ash content and polymerization degree of bamboo pulp decreased gradually， and the whiteness increased continuously.Under the optimum pH value of 3.0， Fock reactivity increased from 68.3% to 72.7%， while further acid treatment combined with DTPA had very little effect on improving Fock reactivity.
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